with the dramatic testimony in the so-called loud music trial. Michael Dunn is charged with killing an unarmed teenager and took the stand in his own defense. ABC's Ryan Owens has the story. Lyme looking out the window and I said you're not going to kill me, you son of a And I shot. He dramatically reenacted how he shot Jordan Davis. He opened the door then he looked at me and said you're dead, . At that point what did you believe was about to happen to you? I thought I was going to be killed. Reporter: Even though police say the teen didn't have a gun Dunn stuck to his story that Davis was a foul-mouthed gun-toting teen who threatened him after Davis refused to turn down his rap music. My rear view mirror was shaking, my eardrums were vibrating. And this was ridiculously loud music. Reporter: Davis' parents could do nothing but listen but the prosecution could and they pounced. Mr. Dunn, the truth is you never told the love of your love that those boys had a gun. You weren't there. Reporter: Prosecutors say Dunn fired ten times at an SUV with four teens inside. Oh, my god. Somebody is shooting. Reporter: Killing Davis in November of 2012 because he felt the teen disrespected him. Jordan Davis was never a threat to you, was he, Mr. Dunn? Absolutely he was. Reporter: Prosecutor John guy also hit Dunn hard for not calling police to report the shooting. Instead, he and his fiancee returned to this hotel and ordered a pizza. You are familiar with 911, are you not? Yes, I am. When you were at the hotel you didn't call 911. I didn't call the police until the following morning. You called the pizza man. Reporter: Dunn has pleaded not guilty and told the jury this is a clear case of self-defense, but prosecutors hope the jury will convict the software developer of first degree murder. The jury should begin deliberating later today with Michael Dunn's own words fresh in their mind. I was in fear for my life. Reporter: For "Good morning America," Ryan Owens, ABC news, Jacksonville, Florida.

This transcript has been automatically generated and may not be 100% accurate.

Nightline 02/11: 'Loud Music' Murder Trial: Michael Dunn Testifies

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The defense presents its case in the trial of the man accused of shooting an unarmed teenager.

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